10567: ABC122 —— A - Double Helix
[Creator : ]
Description
On the Planet AtCoder, there are four types of bases: `A`, `C`, `G` and `T`. `A` bonds with `T`, and `C` bonds with `G`.
You are given a letter $b$ as input, which is `A`, `C`, `G` or `T`. Write a program that prints the letter representing the base that bonds with the base $b$.
You are given a letter $b$ as input, which is `A`, `C`, `G` or `T`. Write a program that prints the letter representing the base that bonds with the base $b$.
Input
Input is given from Standard Input in the following format:
```
$b$
```
```
$b$
```
Output
Print the letter representing the base that bonds with the base $b$.
Constraints
- $b$ is one of the letters `A`, `C`, `G` and `T`.
Sample 1 Input
A
Sample 1 Output
T
Sample 2 Input
G
Sample 2 Output
C